Patent GB-537981-A (GB)
Title: Improvements in or relating to the application of strip material to insoles
IPC: A43D43/06
Filed: 1940-01-12
Abstract: 537,981. Shoe insoles. B. B. CHEMICAL CO., Ltd. (United Shoe Machinery Corporation.). Jan. 12, 1940, No: 696. [Classes 17 (i) and 17 (ii)] On each side of a lipped insole, a fabric reinforcing strip impregnated with thermo-plastic stiffening and coated with adhesive is applied to the inside of the lip and the adjacent surface of the insole. Impregnated and coated strip from a roll is bent so that one margin is turned at about a right angle to the remainder, and is applied to the insole by a roll, the insole 'being engaged on the other side by a feed roll. The applying roll comprises a plurality of freely rotatable discs, each disc being provided with spikes on its periphery which impale the strip and maintain the strip parallel to the lip except at the toe, where the ends of the two strips overlap. Means are provided for supplying adhesive at the end of the strip to be overlapped, and for heating the strip on its way to the applying roll. The insole is engaged at its edge between a driven feed roll 20, Fig. 4, and a co-operating pressure roll 40 geared together, and the strip S is applied by a roll comprising freely rotatable discs 138, 139, 140 provided with spikes 144 penetrating the strip. The applying roll is carried by an arm 100 secured to the short arm of an L-shaped arm 106, Fig. 1, mounted in bearings and carrying an arm 148 linked to a treadle, pressure on which moves the roll to operating position. The arm 100 also supports a reel 94 over which strip material S passes from a roll 90, and a guide 124 wherein the strip is bent longitudinally to conform to the insole and lip. A guide 150 engages the side of the strip remote from the roll, and a spring 110 adjustably determines the tension in the strip. A spring 300 urges the arm 106 endwise so that a head 134, Fig. 4, of the pivot of the applying roll beds the strip S well into the angle between the main body of the insole and the lip. A fixed cam relieves the pressure as the roll is removed from operative position. Guides are provided for the lip as the insole is fed. These comprise a roll 164; Fig. 8A, on an arm 182 maintained in operative position by a latch secured to a lever 174, Fig. 1, pivoted at 176 and actuated by a spring 198 threaded over a link pivoted to an arm 166 which is the continuation of the treadle actuated arm 148. The lever 174 also actuates a lever 192 carrying the guide 162, Fig. 8A, for the, outer side of the lip. When a strip has been applied to the insole the fabric is cut by shears 202, 204, Fig. 9, shaped to engage the strip S first on the side farther from the pivot of the blades. The blades are carried by a slide 208 carrying a second slide 210 having a slot 220 engaging a screw 218 on the movable jaw to close and open the same. The slide 210 is advanced by connections from a solenoid when a switch' 236, Fig. 13, is engaged by the operator's knee. To prevent the blades closing before they are fully advanced a fin 250, Fig. 9, pivoted to the guide for the slides and biassed to operative position by a spring prevents the screw 218 from traversing its slot until it is clear of the fin. Bevels on the screw and fin allow return on retraction of the slides. To prevent the knives being actuated before the applying roll has been raised to out-of-the-way position by release of its treadle 50, Fig. 13, the knee-pad 238 actuating the switch is obstructed by a lever 274 linked to the 'treadle. The length of the strip first laid, from the heel breast location to the toe end, should be longer than the.second strip. To provide this difference the swing of the arm 166, and therefore of the applying roll, to inoperative position; at which the shears advance, is alternately high and lower. The arm carries a link 322, Fig. 1, carrying a pin 324 co-operating with a tip cam 326 which can move with friction about a pivot 328. The cam is formed with a low notch 325 and a high notch 327 and cam surfaces such that'the cam is alternately tipped clockwise and anticlockwise and the pin 324 is alternately allowed to descend to the lower inoperative position or stopped at the higher notch. To apply adhesive to the end of the strip to be overlapped by the second strip, a tank 382 delivers to a pivoted nozzle 376 flow from which is controlled by a needle valve operated by a lever 388. As the nozzle contacts with the lip at the end of the feed, the lever is prevented swinging with the nozzle by a stop 394, and adhesive is supplied to the strip. When starting operating at the toe end; the end portion of the strip is bedded into place by an arm 344, Fig. 7B, a step 362 on which is actuated by a latch 354 engaged.by a stop 368 and pivoted to a link 350 having an arm with a screw-stop 356. As the roll 130 is lowered by depression of the treadle 50, the fixed table 312 and the stop 368, co-operate to swing the arm 344 into its operative position against springs 348, 364. The arm 100 carries an electric resistance 422, Fig. 17, for heating the applying roll by conduction. A pair of electric resistances 414 are swung into proximity to the strip S as the roll reaches operative position. The stiffening agent for the strip may be rosin, a gum such as dammar, copal or cumar or cumaron resin dissolved in toluob. The weft threads of the strip should extend widthwise thereof. A gum known as " Nuba," melting between 100‹ and 125 ‹C. is suitable, dissolved in benzol and naphtha. Alternatively soya bean protein with ammonia and urea dissolved in water may be used.